From ef5d4cf2f9aae4e09883d2d664e367a16b47d857 Mon Sep 17 00:00:00 2001 From: Vlad Yasevich Date: Sun, 16 Dec 2007 14:05:45 -0800 Subject: [PATCH] [SCTP]: Flush fragment queue when exiting partial delivery. At the end of partial delivery, we may have complete messages sitting on the fragment queue. These messages are stuck there until a new fragment arrives. This can comletely stall a given association. When clearing partial delivery state, flush any complete messages from the fragment queue and send them on their way up. Signed-off-by: Vlad Yasevich Signed-off-by: David S. Miller --- net/sctp/ulpqueue.c | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) diff --git a/net/sctp/ulpqueue.c b/net/sctp/ulpqueue.c index 4908041ffb31..1733fa29a501 100644 --- a/net/sctp/ulpqueue.c +++ b/net/sctp/ulpqueue.c @@ -53,6 +53,7 @@ static struct sctp_ulpevent * sctp_ulpq_reasm(struct sctp_ulpq *ulpq, struct sctp_ulpevent *); static struct sctp_ulpevent * sctp_ulpq_order(struct sctp_ulpq *, struct sctp_ulpevent *); +static void sctp_ulpq_reasm_drain(struct sctp_ulpq *ulpq); /* 1st Level Abstractions */ @@ -190,6 +191,7 @@ static void sctp_ulpq_set_pd(struct sctp_ulpq *ulpq) static int sctp_ulpq_clear_pd(struct sctp_ulpq *ulpq) { ulpq->pd_mode = 0; + sctp_ulpq_reasm_drain(ulpq); return sctp_clear_pd(ulpq->asoc->base.sk, ulpq->asoc); } @@ -699,6 +701,37 @@ void sctp_ulpq_reasm_flushtsn(struct sctp_ulpq *ulpq, __u32 fwd_tsn) } } +/* + * Drain the reassembly queue. If we just cleared parted delivery, it + * is possible that the reassembly queue will contain already reassembled + * messages. Retrieve any such messages and give them to the user. + */ +static void sctp_ulpq_reasm_drain(struct sctp_ulpq *ulpq) +{ + struct sctp_ulpevent *event = NULL; + struct sk_buff_head temp; + + if (skb_queue_empty(&ulpq->reasm)) + return; + + while ((event = sctp_ulpq_retrieve_reassembled(ulpq)) != NULL) { + /* Do ordering if needed. */ + if ((event) && (event->msg_flags & MSG_EOR)){ + skb_queue_head_init(&temp); + __skb_queue_tail(&temp, sctp_event2skb(event)); + + event = sctp_ulpq_order(ulpq, event); + } + + /* Send event to the ULP. 'event' is the + * sctp_ulpevent for very first SKB on the temp' list. + */ + if (event) + sctp_ulpq_tail_event(ulpq, event); + } +} + + /* Helper function to gather skbs that have possibly become * ordered by an an incoming chunk. */